<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/dianshang.png" />
      </div>
      <!-- 登陆表单区域 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px" 
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="success" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      //这是登陆表单的数据绑定对象
      loginForm: {
        username: "admin",
        password: "123456"
      },
      loginFormRules: {
        //验证用户名是否正确
        username: [
          { required: true, message: "请输入你的用户名", trigger: "blur" },
          {
            min: 3,
            max: 10,
            message: "长度在 3 到 10  个字符",
            trigger: "blur"
          }
        ],
        //验证密码是否合法
        password: [
          { required: true, message: "请输入你的密码", trigger: "blur" },
          {
            min: 6,
            max: 10,
            message: "长度在 6 到 10  个字符",
            trigger: "blur"
          }
        ]
     
  }
    };
  },
  methods: {
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields();
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        if (!valid) return;
        const { data: res } = await this.$http.post("login", this.loginForm);
        if (res.meta.status !== 200) return this.$message.error("登陆失败");
        this.$message.success("登陆成功");
        //将登陆成功后的 token  保存到客户端中的sessionStorage中
        //项目中除了登陆以外的其他API 接口 必须在登录之后才能访问
        //token只在网站打开期间生效，所以将token保存在sessionStorage中
        window.sessionStorage.setItem("token", res.data.token);
        //通过编程式导航跳转到后台主页，路由地址是/home
        this.$router.push("/home");
      });
    }
  }
};
</script>

<style lang="less" scoped>
.login_container {
  background-color: pink;
  height: 100%;
}
.login_box {
  position: absolute;
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);

  .avatar_box {
    height: 130px;
    width: 130px;

    position: relative;
    left: 50%;
    transform: translate(-50%, -50%);

    img {
      width: 100%;
      height: 100%;
    }
  }
}
.btns {
  display: flex;
  justify-content: flex-end;
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 10px;
  box-sizing: border-box;
}
</style>